Connecting to an aWire target

The pinout for the 6-pin aWire connector is shown in Figure 4.4, “aWire header pinout”

Note: JTAGICE mkII units with hardware revision 0 do NOT have aWire capabilities. For more information on which hardware revision your unit is, see Hardware Revisions

If your unit is revision 0, then aWire programming and debugging is not possible using this hardware. The JTAG interface (if available on your target device) does however provide the same functionality as aWire, although it uses IO pins on the target device.

The pinout shown above is the recommended pinout for aWire, and will be supported natively by future aWire capable tools. The JTAGICE mkII requires that the 10-pin multicoloured "squid" cable be used to map to this pinout.

Table 3.1. Connecting to aWire using the squid cable

JTAGICE mkII probeTarget pinsSquid cable colorsaWire pinout
Pin 1 (TCK) Black 
Pin 2 (GND)GNDWhite6
Pin 3 (TDO) Grey 
Pin 4 (VTref)VTrefPurple2
Pin 5 (TMS) Blue 
Pin 6 (nSRST) Green 
Pin 7 (Not connected) Yellow 
Pin 8 (nTRST) Orange 
Pin 9 (TDI)aWireRed1
Pin 10 (GND) Brown